I'm not worried about those fans. The Punisher still appeals to a lot of people. Lexi Alexander will no doubt throw in a ton of action, and with the type of action she does, the camera is always moving.
Plus this new cast will appeal to people. Fans of 300 and the Wire will take a liking to it. People who are like "Holy **** its Newman! What's he doing in a Punisher movie?" will probably check it out as well. Fans of Rome will also check it out when they see Titus Pullo on the big screen killing even more people.
I'm not worried, I'm actually very optimistic. I think this will do pretty well in theaters compared to the previous film.